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Replace awk with more efficient builtins-only algo

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This commit is contained in:
Devin Teske 2016-01-27 02:11:58 +00:00
parent 788c0c66ab
commit 0f913ed5f9
1 changed files with 55 additions and 9 deletions
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64
usr.sbin/bsdconfig/share/strings.subr
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@ -70,17 +70,63 @@ f_substr()
#
f_snprintf()
{
local __funcname=f_snprintf
local __var_to_set="$1" __size="$2"
shift 2 # var_to_set size
eval "$__var_to_set"=\$\( printf -- \"\$@\" \| \
awk -v max=\"\$__size\" \''
{
len = length($0)
max -= len
print substr($0,0,(max > 0 ? len : max + len))
if ( max < 0 ) exit
max--
}'\' \)
if [ "$__size" -eq 0 ] 2> /dev/null; then
setvar "$__var_to_set" ""
return ${SUCCESS:-0}
elif [ $? -ge 2 ] || [ $__size -lt 0 ]; then
setvar "$__var_to_set" ""
echo "$__funcname: invalid size argument \`__size'" >&2
return ${FAILURE:-1}
fi
local __f_snprintf_tmp
f_sprintf __f_snprintf_tmp "$@"
local __tmp_size=${#__f_snprintf_tmp}
local __trim=$(( $__tmp_size - $__size )) __trimq
local __tbuf __tbuf_len
local __mask __mask_len
while [ $__trim -gt 0 ]; do
__tbuf="?"
__tbuf_len=1
if [ $__trim -le $__size ]; then
while [ $__tbuf_len -lt $(( $__trim / $__tbuf_len )) ]
do
__tbuf="$__tbuf?"
__tbuf_len=$(( $__tbuf_len + 1 ))
done
__trimq=$(( $__trim / $__tbuf_len ))
__trim=$(( $__trim - $__tbuf_len * $__trimq ))
while [ $__trimq -gt 0 ]; do
__f_snprintf_tmp="${__f_snprintf_tmp%$__tbuf}"
__trimq=$(( $__trimq - 1 ))
done
else
__mask="$__f_snprintf_tmp"
while [ $__tbuf_len -lt $(( $__size / $__tbuf_len )) ]
do
__tbuf="$__tbuf?"
__tbuf_len=$(( $__tbuf_len + 1 ))
done
__trimq=$(( $__size / $__tbuf_len ))
if [ $(( $__trimq * $__tbuf_len )) -ne $__size ]; then
__tbuf="$__tbuf?"
__tbuf_len=$(( $__tbuf_len + 1 ))
fi
__mask_len=$(( $__tmp_size - $__tbuf_len * $__trimq ))
__trim=$(( $__tmp_size - $__mask_len - $__size ))
while [ $__trimq -gt 0 ]; do
__mask="${__mask#$__tbuf}"
__trimq=$(( $__trimq - 1 ))
done
__f_snprintf_tmp="${__f_snprintf_tmp%"$__mask"}"
fi
done
setvar "$__var_to_set" "$__f_snprintf_tmp"
}
# f_sprintf $var_to_set $format [$arguments ...]